Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 83
ust notice that there are two sorts of reflection, one known asregular or as specular reflection, which follows very rigid and pre-cise rules, the other diffused or irregular reflection, which is eman-cipated from these restraints, but has its own special conditions andmodes of action. When rays of… … or Its normal {i. e. line perpendiculai;to the Burface), are equal. Thisis illustrated by the accompanying cut. We have here a vertical graduated circle, on which degrees aremarked and numbered right and left from the point M. At the centre is a little horizontal mirror. Bymeans of the adjustable…
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